Add a md5 muxer that allows checking the md5 sums of generated streams without

needing an external MD5 command.

Originally committed as revision 23257 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/allformats.c

@@ -106,6 +106,7 @@ void av_register_all(void)
     REGISTER_DEMUXER  (IV8, iv8);
     REGISTER_DEMUXER  (LMLM4, lmlm4);
     REGISTER_MUXDEMUX (M4V, m4v);
+    REGISTER_MUXER    (MD5, md5);
     REGISTER_MUXDEMUX (MATROSKA, matroska);
     REGISTER_MUXER    (MATROSKA_AUDIO, matroska_audio);
     REGISTER_MUXDEMUX (MJPEG, mjpeg);